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EL7531 Datasheet

Monolithic 1A Step-Down Regulator with Low Quiescent Current

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®
Data Sheet
September 30, 2004
EL7531
FN7428.4
Monolithic 1A Step-Down Regulator with
Low Quiescent Current
The EL7531 is a synchronous, integrated FET 1A step-down
regulator with internal compensation. It operates with an
input voltage range from 2.5V to 5.5V, which accommodates
supplies of 3.3V, 5V, or a Li-Ion battery source. The output
can be externally set from 0.8V to VIN with a resistive
divider.
The EL7531 features automatic PFM/PWM mode control, or
PWM mode only. The PWM frequency is typically 1.4MHz
and can be synchronized up to 12MHz. The typical no load
quiescent current is only 120µA. Additional features include
a Power-Good output, <1µA shut-down current, short-circuit
protection, and over-temperature protection.
The EL7531 is available in the 10-pin MSOP package,
making the entire converter occupy less than 0.15 in2 of
PCB area with components on one side only. The 10-pin
MSOP package is specified for operation over the full -40°C
to +85°C temperature range.
Ordering Information
Features
• Less than 0.15 in2 (0.97 cm2) footprint for the complete 1A
converter
• Components on one side of PCB
• Max height 1.1mm MSOP10
• Power-Good (PG) output
• Internally-compensated voltage mode controller
• Up to 94% efficiency
• <1µA shut-down current
• 120µA quiescent current
• Over-current and over-temperature protection
• External synchronizable up to 12MHz
• Pb-free Available
Applications
• PDA and pocket PC computers
• Bar code readers
PART
NUMBER
PACKAGE
TAPE & PKG.
REEL DWG. #
EL7531IY
10-Pin MSOP
- MDP0043
EL7531IY-T7
10-Pin MSOP
7” MDP0043
EL7531IY-T13
10-Pin MSOP
13” MDP0043
EL7531IYZ (Note) 10-Pin MSOP (Pb-free) - MDP0043
EL7531IYZ-T7 (Note) 10-Pin MSOP (Pb-free) 7” MDP0043
EL7531IYZ-T13
(Note)
10-Pin MSOP (Pb-free) 13” MDP0043
• Cellular phones
• Portable test equipment
• Li-Ion battery powered devices
• Small form factor (SFP) modules
Pinout and Typical Application Diagram
EL7531
TOP VIEW
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
C1
10µF
VO (1.8V@1A)
VS (2.5V-6V)
L1
C2
10µF
1.8µH
R3
100
C3
0.1µF
1 SGND
2 PGND
3 LX
4 VIN
5 VDD
FB 10
VO 9
PG 8
EN 7
RSI 6
R4 100k
R1*
100k
R2*
124k
C4
470pF
PG
EN
SYNC
R6
100k
R5 100k
* VO = 0.8V * (1 + R2 / R1)
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

EL7531 Datasheet

Monolithic 1A Step-Down Regulator with Low Quiescent Current

No Preview Available !

EL7531
Absolute Maximum Ratings (TA = 25°C)
VIN, VDD, PG to SGND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VIN + +0.3V)
SYNC, EN, VO, FB to SGND . . . . . . . . . . . . . -0.3V to (VIN + +0.3V)
PGND to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2A
Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are
at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications VDD = VIN = VEN = 3.3V, C1 = C2 = 10µF, L = 1.8µH, VO = 1.8V (as shown in Typical Application Diagram),
unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN TYP MAX UNIT
DC CHARACTERISTICS
VFB
VOUT/VOUT
Feedback Input Voltage
VFB vs Temperature
PWM mode
Junction temperature = -40°C to +85°C
(see Figure 7)
790 800 810 mV
0.3 %
VOUT/VOUT
VOUT/VOUT
IFB
VIN, VDD
VIN,OFF
VIN,ON
IS
IDD
Line Regulation
Load Regulation
Feedback Input Current
Input Voltage
Minimum Voltage for Shutdown
Maximum Voltage for Startup
Input Supply Quiescent Current
Active - PFM Mode
Active - PWM Mode
Supply Current
RDS(ON)-PMOS PMOS FET Resistance
RDS(ON)-NMOS NMOS FET Resistance
ILMAX
Current Limit
TOT,OFF
Over-temperature Threshold
TOT,ON
Over-temperature Hysteresis
IEN, ISYNC EN, SYNC Current
VEN1, VSYNC1 EN, SYNC Rising Threshold
VEN2, VSYNC2 EN, SYNC Falling Threshold
VPG
Minimum VFB for PG, WRT Targeted
VFB Value
VOLPG
PG Voltage Drop
AC CHARACTERISTICS
VIN = 3.3V to 5V, IO = 1A (see Figure 7)
IO = 0A to 1A, VIN = 3.3V (see Figure 7)
VIN falling
VIN rising
VSYNC = 0V
VSYNC = 3.3V
PWM, VIN = VDD = 5V
EN = 0, VIN = VDD = 5V
VDD = 5V, wafer test only
VDD = 5V, wafer test only
T rising
T falling
VEN, VRSI = 0V and 3.3V
VDD = 3.3V
VDD = 3.3V
VFB rising
VFB falling
ISINK = 3.3mA
0.1 %
0.4 %
100 nA
2.5 5.5 V
2 2.2 V
2.2 2.4 V
120 145
µA
6.5 7.5 mA
400 500
µA
0.1 1 µA
70 100 m
45 75 m
1.5 A
145 °C
130 °C
-1 1 µA
2.4 1.8
V
9 1.4 0.8 V
95 %
86 %
35 70 mV
FPWM
tSYNC
tSS
PWM Switching Frequency
Minimum SYNC Pulse Width
Soft-start Time
Guaranteed by design
1.25 1.4
25
650
1.6 MHz
ns
µs
2 FN7428.4


Part Number EL7531
Description Monolithic 1A Step-Down Regulator with Low Quiescent Current
Maker Intersil Corporation
Total Page 10 Pages
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